Sorry to reply to an old thread!
I joined this forum today just to reply my results after seeing this thread a week ago!
My little Pixel is a bar chewer and even with all the toys/boredom breakers i buy and plus she has a 12inch wheel and a Hamster Heaven she continued!
This thread really helped me get to the bottom of the pesky bar chewing and she hasn't chewed in a couple of days now! I think it was down to getting her out when chewing or giving her attention for it! Oops silly me for rewarding a habbit!
Thank you to the OP for this post it has really helped!